text: from transformers import BertModel
  
  from transformersx.data import TaskDataProcessor
  from transformersx.task import DefaultTransformerTask, TaskConfig
  from transformersx.train import TaskContext
  from transformersx.transformersx_base import to_json_string
  
  
  class DefaultTransformerTaskForTest(DefaultTransformerTask):
      def __init__(self, config: TaskConfig):
          super().__init__(config)
  
      def _create_task_context(self, config: TaskConfig) -> TaskContext:
          data_processor = TaskDataProcessor()
          data_processor.get_labels = lambda: ['0']
          return TaskContext(
              task_name='sentiment',
              data_processor=data_processor,
              model_class=BertModel,
              compute_metrics=self.compute_metrics
          )
  
      def compute_metrics(self):
          pass
  
  
  class Test_Transformersx_task:
      def test_task_config(self):
          print(to_json_string(TaskConfig()))
  
      def test_default_task(self):
          DefaultTransformerTaskForTest(TaskConfig())
  